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Copper Oxides

Copper Oxide Thin Films on Au(111)

  • Cu deposition in 10-5 mbar O2 on Au(111)
  • Post-annealing in vacuum at temperatures between 450 and 700 K
  • Water adsorption at 100 K probed via STM, TDS and IRAS

Film Morphology

  • flat and homogenous films with Cu2O stoichiometry according to XPS
  • Several terminations (hexagonal, stripes, donuts) at different annealing temperatures
  • Dominant phase: hexagonal lattice with 6Å periodicity

Electronic properties

  • Fundamental gap: 2.0 eV (smaller than bulk)
  • Cu 4s surface state in unoccupied part of gap
  • Surface state vanishes in CuCus-poor structures

Water Adsorption

  • Zero order desorption at 155 K due to amorphous solid water
  • First-order peak at 175 K from H2O monolayer
  • H2O physisorption to oxygen-terminated Cu2O(111) surface

Water Monolayer in STM

  • Cyclic water clusters at low coverage
  • Growth of monolayer H2O islands starting from step edges
  • Short-ranged hexagonal order in H2O islands reflecting weak template effect of the Cu2O surface

For details:

Growth and Surface Properties of Cuprous Oxide grown on Au(111): Sträter et al. J. Phys. Chem. C 119 (2015) 5975.

Incorrect DFT- GGA predictions of the stability of non-stoichiometric/polar dielectric surfaces: The case of Cu2O(111): Nilius et al. PCCP 18 (2016) 6729.

Water Adsorption on Cu2O(111) Surfaces – An STM Study: Möller et al. J. Phys. Chem. C 121 (2017) 20877.

Temperature-Dependent Phase Evolution of Copper-Oxide Thin-Films on Au(111): Möller et al. Phys. Chem. Chem. Phys. 20 (2018) 5636

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